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There are 3 thirteen-letter words containing OTAC

GEOTACTICALLYgeotactically adv. By means of, or in terms of, geotaxis.
GEOTACTICAL adv. relating to geotaxis, the response of an organism to gravity, also GEOTACTIC.
HETEROTACTOUSHETEROTACTOUS adj. relating to heterotaxis, the anomalous arrangement of body parts.
PROTACTINIUMSPROTACTINIUM n. a radioactive metallic chemical element, a member of the actinide series which occurs as a decay product in uranium ores.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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